[libcxxabi] [libunwind] [WebAssembly] __USING_WASM_EXCEPTIONS__ -> __WASM_EXCEPTIONS__ (PR #92840)

[Heejin Ahn via cfe-commits]

aheejin wrote:

It is hard to fix the clang-format errors because the modified files generally don't conform to the clang-format style anyway, so clang-format my change currently affects hundreds of unrelated lines.
```console
aheejin at aheejin:~/llvm-project/libunwind$ git clang-format main
changed files:
    libcxxabi/include/cxxabi.h
    libcxxabi/src/cxa_exception.cpp
    libcxxabi/src/cxa_personality.cpp

aheejin at aheejin:~/llvm-project/libunwind$ git diff --stat
 libcxxabi/include/cxxabi.h        |  13 +-
 libcxxabi/src/cxa_exception.cpp   |   2 +-
 libcxxabi/src/cxa_personality.cpp | 256 ++++++++++++++++++----------------------
 3 files changed, 123 insertions(+), 148 deletions(-)
```

https://github.com/llvm/llvm-project/pull/92840